in the united states, congress has told the u.s. airspace regulator to open up north america to drones by 2015. but are we ready for a world in which thousands of drones are patrolling our skies? >> they are the eyes and ears of the armed forces. a decade ago, less than 5% of u.s. military aircraft were unmanned. now 40% have no pilots onboard. many think the f-35 will be the last conventional fighters ever flown by the r.a.f. but the role of the drone is now changing. british skies are about to open up to thousands of civilian drones. who is watching the drone operators and how safe is this new technology? next to an army training zone in the british countryside is a glimpse of how drones could be used in the future. it might not look like the spy planes in afghanistan or yemen, but this is one of the first commercial uses of an unmanned aircraft in the u.k. itself. as the cost of digital cameras come down, some new applications are starting to become possible. >> 38,000 feet, 1,000 knots, 76%. >> these light-weight drones fly by t